Physics – Plasma Physics
Scientific paper
Sep 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...232..940c&link_type=abstract
Astrophysical Journal, Part 1, vol. 232, Sept. 15, 1979, p. 940-947.
Physics
Plasma Physics
73
Autoionization, Electron-Ion Recombination, Ion Production Rates, Plasma Physics, Rarefied Plasmas, Abundance, Electron Impact, Electron Scattering, Ground State, Radioactive Decay, Sodium, Solar Corona, Toroidal Plasmas
Scientific paper
Electron impact collisions with ground-state ions in a low-density plasma may cause ionization either by direct ejection of an electron from the ion, or by excitation of an inner-subshell electron to an autoionizing level. The importance of the indirect process in sodium-like Fe XVI is investigated by means of detailed calculations of excitation cross sections and of branching ratios for autoionization versus radiative decay; the estimated accuracy is about 20%. It is found that radiative decay reduces the autoionization rate (at kT = 300-500 eV) to only about 52% of the excitation rate; even so, the indirect ionization rate is about 1.4-1.6 times the direct ionization rate in this temperature range. The relative importance of indirect to direct ionization is approximately as great for Na-like Mo XXXII as for Fe XVI, but should be much smaller for most non-alkali-like ions except Cu-like, Zn-like, and perhaps Ga-like ions.
Cowan Robert D.
Mann Joseph B.
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